# CBSE 8th Science Computer Based Exam

25 Questions | Total Attempts: 35

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• 1.
A sound wave travels from east to west, in which direction do the particles of air move
• A.

East – west

• B.

North - south

• C.

Up and down

• D.

None of these

• 2.
In which medium sound travels faster
• A.

Solid

• B.

Liquid

• C.

Gas

• D.

None of these

• 3.
What is the name of short duration wave
• A.

Pulse

• B.

Frequency

• C.

Time period

• D.

Velocity

• 4.
What is the velocity of sound in water at room temperature
• A.

1500 m/s

• B.

330 m/s

• C.

1500 km/s

• D.

340 km/s

• 5.
The unit of quantity on which pitch of the sound depends is
• A.

Hertz

• B.

Metre

• C.

Metre/second

• D.

Second

• 6.
The unit of quantity on which loudness of found depends is
• A.

Metre

• B.

Hertz

• C.

Metre/second

• D.

Second

• 7.
Nature of sound wave is
• A.

transverse

• B.

Longitudinal

• C.

Electromagnetic

• D.

Seismve

• 8.
Pitch of high frequency sound is
• A.

High

• B.

low

• C.

zero

• D.

Infinite

• 9.
Voice of a friend is recognized by its
• A.

Pitch

• B.

Quality

• C.

Intensity

• D.

Velocity

• 10.
Sound waves in air are
• A.

Longitudinal waves

• B.

• C.

Transverse waves

• D.

Electromagnetic waves

• 11.
Pitch is the sensation  of the ---------- of an emitted sound
• 12.
A high pitch sound is called a ------ sound
• 13.
A low pitch sound is called a -----------  sound
• 14.
Loudness of sound wave is ditectly proportional to -------- amplitude
• 15.
The sound energy transferred per unit area per unit time is called -------- of sound
• 16.
When a body moves with a speed which is greater than the speed of sound in air, it is said to be traveling at --------------
• 17.
When wound waves traveling in air enter into the medium of water, ------- remains unchanged
• 18.
Sound travels faster as the  ------------ of the medium increases by 0.61 m/s
• 19.
-----is an apparatus which is used to find the depth of a sea or to locate the under water
• 20.
A sound wave of single frequency is called ---------
• 21.
The property of metals by which they can be beaten in to thin sheets is called
• A.

Malleability

• B.

Ductility

• C.

Conduction

• D.

Expansion

• 22.
Which one of the following is a good conductor of electricity
• A.

Iron

• B.

Plastic

• C.

Wood

• D.

Glass

• 23.
The metals that produce ringing sounds, are said to be
• A.

Malleable

• B.

Sonorous

• C.

Lustrous

• D.

Hard

• 24.
Which one of the following metal reacts vigorously with oxygen and water
• A.

Sodium

• B.

Potassium

• C.

Calcium

• D.

Magnesium

• 25.
Which gas are produced when metal react with acids
• A.

Oxygen

• B.

Nitrogen

• C.

Hydrogen

• D.

Carbon dioxide

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